var winWidth = 0; 
var winHeight = 0; 
function findDimensions() //函数：获取尺寸 
{ 
	//获取窗口宽度 
	if (window.innerWidth) 
		winWidth = window.innerWidth; 
	else if ((document.body) && (document.body.clientWidth)) 
		winWidth = document.body.clientWidth; 
	//获取窗口高度 
	if (window.innerHeight) 
		winHeight = window.innerHeight; 
	else if ((document.body) && (document.body.clientHeight)) 
		winHeight = document.body.clientHeight; 
	//通过深入Document内部对body进行检测，获取窗口大小 
	if (document.documentElement && document.documentElement.clientHeight && document.documentElement.clientWidth) 
	{ 
		winHeight = document.documentElement.clientHeight; 
		winWidth = document.documentElement.clientWidth; 
	} 
} 
findDimensions(winWidth);
var helpCenMarLe = winWidth + "px";
//document.getElementById("footer_new").style.width=helpCenMarLe;

$(document).ready(function() {
	var helpp = (screen.width - 820)/2;
	var helppx = helpp + "px";
	$("#helpCenter").css("margin-left",helppx);
})